d15b vs d15b7

[94tuner]

ok i have a 92 hatch with a jdm d15b. I also have a hatch as a parts car and it has a d15b7. I know obviously the b7 is non vtec and the b is. But my question is there a difference in the blocks? If the blocks are the same i was going to rebuild the b7 so that way i could still drive everyday and just put the b head on when i swap. Thanks.

 

[AHHVTEC]

yes you can put the d15b head on the b7

 

[K2e2vin]

The actual blocks are the same, but the components inside are different: The D15B VTEC crankshaft is fully counter-weighted(also makes it heavier) and has larger rod journals(D16-sized) along with "D16 rods" and specific 27mm compression height pistons. The water pump is also different; the JDM motor uses D15Z1-style water pump.

 

[94tuner]

So would i lose power by putting the vtec head on the b7 block vs the b block?

 

[K2e2vin]

Depends on the tuning, but the non-VTEC block should have higher compression compared to a stock D15B. I haven't tried this but the main concern is that valve relief/piston-valve clearance(probably not an issue with stock cams).

 

[mykorn]

how about intake manifold for both d15b vtec & non-vtec? is it same?